QR Codes have four error correction levels: L (Low), M (Medium), Q (Quartile) and H (High). These levels denote the amount of the QR Code that can be damaged or obscured while maintaining its functionality:

• L Level: This level offers error correction capability of up to 7%. It has the lowest level of error correction and is useful when code has minimal risk of being damaged, for example when displayed digitally on a phone. Generally not a good option for QR Codes printed on packaging.
• M Level: This level provides error correction capability of up to 15%. It is an intermediate level, suitable for situations where there may be some risk of damage, but which is expected to be minimal.
• Q Level: This level offers up to 25% error correction capability. It is a higher error correction level suitable for situations where the QR Code may face greater risk of damage.
• H Level: This is the highest level of error correction, with error correction capacity of up to 30%. It is ideal for situations where the QR Code presents a greater risk of damage, such as external displays or when printed on physical products that may suffer wear.

L Level: Low - 7%

M Level: Medium - 15%

Q Level: Quartile - 25%

H Level: High - 30%